Tramlining? Any one notice the b8 tramlining a lot? my wife's b8 seems to do it way more then my
02-25-2009, 12:46 PM
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both have ps2's. hers are 245s and mine are 235s
doesn't seem like it should be that big of a difference.
that's why i'm interested in whether others have experienced it
that's why i'm interested in whether others have experienced it
02-25-2009, 06:31 PM
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I'm not getting that with my 245/40-R18 P6 Pirellis....
Our '02 allroad did a lot of that until we replaced the tires and got a 4 wheel alignment done - been fine since. Could be a defective steel belt in a tire or an alignment issue. The dealer should be responsible for this since it's new.
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03-01-2009, 08:46 PM
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bzzt. it's determined by both. from tirerack's tech articles:
"Because tires have flexible sidewalls, a single tire size will fit on a variety of rim widths. A tire's rim width range identifies the narrowest to the widest rim widths that the tire is designed to fit. The width of the rim will influence the width of the tire. A tire mounted on a narrow rim would be "narrower" than if the same size tire was mounted on a wide rim. NOTE: Because the overall diameter of a steel belted radial is determined by the steel belts, there is little, if any, change to the overall diameter of the tire due to differences in rim width.
The industry rule of thumb is that for every 1/2" change in rim width, the tire's section width will correspondingly change by approximately 2/10".
For example: a tire in the P205/60R15 size is measured on a 6.0" wide wheel and this size tire has an approved rim width range from 5.5" to 7.5" wide. The tire has a section width of 8.23" (209mm) when mounted on a 6.0" wide wheel. If that tire were mounted on all of the rims within its range, the tire's approximate section width would change as follows:
Difference from
Measuring Rim Rim
Width Approximate Tire
section width
0.5" narrower 5.5" 8.03"
Measuring Rim 6.0" 8.23"
0.5" wider 6.5" 8.43"
1.0" wider 7.0" 8.63"
1.5" wider 7.5" 8.83"
Because of the different wheel widths used in the above example, there is a 8/10" projected difference in tire section width when comparing a tire mounted on the narrowest rim to the widest rim within its range. This may affect fenderwell and frame clearances when selecting optional aftermarket wheel and tire packages."<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Ftires%2Ftiretech%2Ftirespec skey.jsp">article</a></li></ul>
The industry rule of thumb is that for every 1/2" change in rim width, the tire's section width will correspondingly change by approximately 2/10".
For example: a tire in the P205/60R15 size is measured on a 6.0" wide wheel and this size tire has an approved rim width range from 5.5" to 7.5" wide. The tire has a section width of 8.23" (209mm) when mounted on a 6.0" wide wheel. If that tire were mounted on all of the rims within its range, the tire's approximate section width would change as follows:
Difference from
Measuring Rim Rim
Width Approximate Tire
section width
0.5" narrower 5.5" 8.03"
Measuring Rim 6.0" 8.23"
0.5" wider 6.5" 8.43"
1.0" wider 7.0" 8.63"
1.5" wider 7.5" 8.83"
Because of the different wheel widths used in the above example, there is a 8/10" projected difference in tire section width when comparing a tire mounted on the narrowest rim to the widest rim within its range. This may affect fenderwell and frame clearances when selecting optional aftermarket wheel and tire packages."<ul><li><a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Ftires%2Ftiretech%2Ftirespec skey.jsp">article</a></li></ul>
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